Rock drill



July 11, TE RY ROCK DRILL Filed July 50, 1931 n i was 769- 747 /709 INVEN TOR.

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Q g Q g HISATTORNEY Patented July 11, 1933 UNITED STATES TENT-i missesEDWARD r. TERRY, or rI-Ii rrsBnne; NEW JERSEY, nssrdnon Tomavensserm-RAND COMPANY, or JERSEY one,

unwiannsnY, A ooarona'rron or NEW JERSEY Application fiiii -sin so,

This invention relates to rock drillsfand more particularly to a. guidefor rock drills of the type which are mounted in supports ing shellswhereon they slide to and from the work. .5 V

One object of the invention is to minimize the cost of maintenance ofrock drills of this type and another object is to equip the rock drillwith a guide which may be convenient-e ly attached thereto andwhich-will remain in rigid assembled relationship with respect to therock drill; 1

Other objects will be in part obvious and in part pointed outhereinafter. 1

In-the drawing accompanying thisspecification and in which'similarreference characters refer to similar parts, i

Figure l is a longitudinal elevation partly in section of a rock drillconstructedin accordance with the practice of the invention,

Figure 2 is an end elevation illustrating the manner in which one end ofthe guide is secured to the rock drill, 4

Figures 3 and 4 are transverse views taken through Figure 1 on the lines33 and 4% looking in the direction indicated by the arrows, and

Figure 5 is a perspective view of the guide. 7

Referring more particularly to the drawing, A designates generally arock drill comprising a cylinder B and front and back heads C and Drespectively which may be secured to the cylinder by side rods or boltsE arranged on the opposite sides of the drill.

Within the cylinder B is a reciprocatory hammer piston F having anextension G- which extends slidably through chuck mechanism designatedgenerally by Hand being arranged in the front head C and in a bush ing Jdisposed in the front end of the cylinder B. The bushing J carries atits front end an external lateral flange K to seat upon the rear end ofthe front head 0.

The chuck mechanism H may, as is customary, be rotatable within thefront head and the bushing J and, in the present instance, serves as aguide for an anvil block L against which the blows of the hammer pistonF are delivered and which serves to 1931. Serial No. 552,938.

transmit suchblows .tothe working implement 0 g'uided by the chuckmechanisn'r'H.

In accordancewith the practice of the in.- vention and incontradistinction from the usual practice. of equipping the cylinderwith integral guide ribs to slidably interlock with a mounting, such-asa shell P shown in: Figure 2, the rock drill is pro- "vided with aremovable guide Q comprising a beam or. plate portion R which, in theassembled position, lies beneath the rock drill and more particularlybeneath the cylinder B. The outer sides or edges of the beam Rconstitute guide ribs S which are adapted to slide in guidewaysT of the.shell'P. The beam B may be suitably reinforced by means of integraltopiand bottom'ribs U and V ;respectively and which preferably extendalongthe entire length of the bea1n.-

Formed as'an integral'portion of the beam Rand on the front end thereofis a sleeve WV which,- in thefassembled position of the guide, isdisposed between the front end of the cylinder B and the rear end of theflange K and has a bore Xto receive the portion of the bushing Jadjacent the flange K against which the front end of the sleeve seats. I

On the rear end of the guide and on the bottom surface thereof is a lugY having a bore Z to receive a feed nut b which is threaded in a wellknown manner for engagement with a feed screw 0 commonly employed foractuating the rock drill A longitudinally of the shell. The feed nut bmay be held against rotation in any convenient manner. The rear end ofthefeed nut 7) projects rearwardly of the lug Y and has a threadedexterior for the reception of a nut cl whereby the feed nut bis fastenedsecurely in position.

The guide is of such length that when it I occupies the assembledposition described the rear end thereof lies substantially in the sametransverse plane as the rear end of, the back head D. Thusarranged'these ends of the back head and the guide serve as abutmentsfor one side of a flexible connection 0 in the form of laminated springscomprising a plurality of plates f which extend laterally of the feednut 2') upon which they are arranged to support the rear end of the rocki drill.

In order to maintain the weight of the flexible connection to a minimumthe plates f may be of substantially Y-shape having stems wherein areformed apertureszh :to permit the stems g to be disposed cuplonrtheprojecting end of the feed nut Z) between the rear 'endof the guide andthe nut (Q whereby they are clamped securely together.

The diverging'wings or arms? of the ,Y

shaped plates f extend upwardly across the transverse medium plane ofthe rock drill and are provided with perforations '10 through whichextend the side rods E'wherebyathe arms j ofthe plates f are clampedsecurely against the head D. r i I As a preferred form of constructionthe sleeve portion W of the guide is provided on rear end of the -.back

, its opposite sides with lugs 0 having aperas the ribs F of the presentstructureyare exposed to severe usage :and etc consequent great wear.This is a iactor which in structures wherein the guide ribs form anintegral portion of the cylinder. B is the cause of considerable expensesince, in such structures, whenever the guide ribs become worn to astate of unserviceability it becomes necessary to discard the entirecylinder. Constructed as in the present invention, Whenever the guideribs'become worn only the comparatively inexpensive guide need bereplaced. 1

Another highly desirable advantage is that, owing to-the provision ofthe flexible connection 6, any variations within'practical limits in therelative lengths of the guide and the casing parts of the rock drill,such as the'cylinder and'the back head, may be readily compensated forby the flexibility oi the plates comprising the connection 0. i

I claim': I

1, In combination, a rock drill having a plurality of easing parts, ,aguide for the rock drill, means .on the guide beingi-nterposed betweenadj acent casing par-ts, clamping means for securing the first-mentioned-means and the casing parts together, and ,a

flexible connection on'the clamping means and being secured to the guide:by the clamping means to support the rear end of the rock drill.

I2. In combination, a rock drill,-a guide for the rock drill, means onthe guide forming a casing part of the rock, ielrillpa plate springsecured zto the rear end of the guide to support the rear' end of therock .drill, and

bolts for clamping .the' said means and the I plate spring to therockdrill. a i 3. In combination, a rocktlrill, a guide for the rockdrill, a sleeve integral with the guide ztor-rning a casing pant ofz herock drill, a laminated plate springon the rear end of the guide tosupport the rearend of the rock drill. v

In testimony whereof I have signed this specification. a, WAR F. TEBBY-

